The Ibanag (also Ybanag and Ybanak or Ibanak) are an ethnolinguistic minority numbering a little more than half a million people, who inhabit the provinces of Cagayan, Isabela, and Nueva Vizcaya.

This toponym-based name is similar to the unrelated etymology for the Tagalog people, which is derived from taga- ("person from") and ilog ("river") The Ibanag language (also Ybanag) is spoken by about 500,000 speakers in two of the northeasternmost provinces of the Philippines, Isabela, and Cagayan.

It is closely related to Gaddang, Itawis, Agta, Atta, Yogad, Isneg, and Malaweg.

There are also several speakers of the Ibanag language in Abulug, Aparri, Camalaniugan, Lal-lo, and Tuao in Cagayan.

Minority Ibanag speakers can be found outside of their regional homeland, such as Metro Manila, Mindoro, Palawan and Mindanao, particularly in Sulu Archipelago.